gdb/testsuite/gdb.threads/linux-dp.exp

   1 # Copyright 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16
  17 # Please email any bugs, comments, and/or additions to this file to:
  18 # bug-gdb@gnu.org
  19
  20 #### Dining Philosophers, on LinuxThreads - Jim Blandy <jimb@cygnus.com>
  21 ####
  22 #### At the moment, GDB's support for LinuxThreads is pretty
  23 #### idiosyncratic --- GDB's output doesn't look much like the output
  24 #### it produces for other thread implementations, messages appear at
  25 #### different times, etc.  So these tests are specific to LinuxThreads.
  26 ####
  27 #### However, if all goes well, Linux will soon have a libthread_db
  28 #### interface, and GDB will manage it the same way it does other
  29 #### libthread_db-based systems.  Then, we can adjust this file to
  30 #### work with any such system.
  31
  32 ### Other things we ought to test:
  33 ### stepping a thread while others are running
  34 ### killing and restarting
  35 ### quitting gracefully
  36
  37 if $tracelevel then {
  38         strace $tracelevel
  39 }
  40
  41 set prms_id 0
  42 set bug_id 0
  43
  44 # This only works with Linux configurations.
  45 if ![istarget *-*-linux-gnu] then {
  46     return
  47 }
  48
  49 set testfile "linux-dp"
  50 set srcfile ${testfile}.c
  51 set binfile ${objdir}/${subdir}/${testfile}
  52 if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug libs=-lpthread}] != ""} {
  53     return -1
  54 }
  55
  56 gdb_start
  57 gdb_reinitialize_dir $srcdir/$subdir
  58 gdb_load ${binfile}
  59 send_gdb "set print sevenbit-strings\n" ; gdb_expect -re "$gdb_prompt $"
  60 runto_main
  61
  62 # There should be no threads initially.
  63 gdb_test "info threads" "" "info threads 1"
  64
  65 # Try stepping over the thread creation function.
  66 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]
  67 set expect_manager -1
  68 for {set i 0} {$i < 5} {incr i} {
  69     gdb_continue_to_breakpoint "about to create philosopher: $i"
  70     send_gdb "next\n"
  71     gdb_expect {
  72         -re "\\\[New .*\\\].*\\\[New .*\\\].*$gdb_prompt $" {
  73             # Two threads are created the first time in LinuxThreads,
  74             # where the second is the manager thread.  In NPTL, there is none.
  75             if {$i == 0} {
  76                 set expect_manager 1
  77             }
  78             pass "create philosopher: $i"
  79         }
  80         -re "\\\[New .*\\\].*$gdb_prompt $" {
  81             if {$i == 0} {
  82                 set expect_manager 0
  83             }
  84             pass "create philosopher: $i"
  85         }
  86         -re "Program received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" {
  87             # It would be nice if we could catch the message that GDB prints
  88             # when it first notices that the thread library doesn't support
  89             # debugging, or if we could explicitly ask GDB somehow.
  90             unsupported "This GDB does not support threads on this system."
  91             return -1
  92         }
  93         -re "$gdb_prompt $" {
  94             # We used to fail here, but not all targets announce new
  95             # threads as they are created.  For example, the GDB
  96             # remote protocol target only finds out about threads when
  97             # they actually report some event like a breakpoint hit,
  98             # or when the user types 'info threads'.
  99             unresolved "create philosopher: $i"
 100         }
 101         timeout {
 102             fail "(timeout) create philosopher: $i"
 103         }
 104     }
 105 }
 106
 107 set nthreads 6
 108
 109 # Run until there are some threads.
 110 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
 111 gdb_continue_to_breakpoint "main thread's sleep"
 112 set info_threads_ptn ""
 113 for {set i $nthreads} {$i > 0} {incr i -1} {
 114     append info_threads_ptn "$i Thread .*"
 115 }
 116 append info_threads_ptn "\[\r\n\]+$gdb_prompt $"
 117 set info_threads_manager_ptn "[expr $nthreads + 1] Thread .*$info_threads_ptn"
 118
 119 gdb_test_multiple "info threads" "info threads 2" {
 120     -re "$info_threads_manager_ptn" {
 121         # We did see a manager thread.  Check that against what we expected.
 122         switch -exact -- $expect_manager {
 123             -1 {
 124                 # We weren't sure whether to expect a manager thread.
 125                 pass "info threads 2"
 126             }
 127             1 {
 128                 # We were expecting a manager thread.
 129                 pass "info threads 2"
 130             }
 131             0 {
 132                 # We were not expecting to see the manager thread.
 133                 fail "info threads 2"
 134             }
 135         }
 136         set expect_manager 1
 137         incr nthreads
 138     }
 139     -re "$info_threads_ptn" {
 140         # We did not see a manager thread.  Check that against what we
 141         # expected.
 142         switch -exact -- $expect_manager {
 143             -1 {
 144                 # We weren't sure whether to expect a manager thread.
 145                 # Don't expect it from here on out.
 146                 pass "info threads 2"
 147             }
 148             1 {
 149                 # We were expecting a manager thread, but we didn't see one.
 150                 fail "info threads 2"
 151             }
 152             0 {
 153                 # We were not expecting to see the manager thread.
 154                 pass "info threads 2"
 155             }
 156         }
 157         set expect_manager 0
 158     }
 159 }
 160
 161
 162 # Try setting a thread-specific breakpoint.
 163 gdb_breakpoint "print_philosopher thread 5"
 164 gdb_continue_to_breakpoint "thread 5's print"
 165 # When there is no debugging info available for the thread library,
 166 # the backtrace entry for philosopher's caller looks like:
 167 #    #1  0x4001c548 in pthread_create () from /lib/libpthread.so.0
 168 # If you do have debug info, the output obviously depends more on the
 169 # exact library in use; under NPTL, you get:
 170 #    #2  0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264
 171 gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\).*" \
 172         "first thread-specific breakpoint hit"
 173
 174 # Make sure it's catching the right thread.  Try hitting the
 175 # breakpoint ten times, and make sure we don't get anyone else.
 176 set only_five 1
 177 for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
 178     gdb_continue_to_breakpoint "thread 5's print, pass: $i"
 179     send_gdb "info threads\n"
 180     gdb_expect {
 181         -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {
 182             # Okay this time.
 183         }
 184         -re ".*$gdb_prompt $" {
 185             set only_five 0
 186         }
 187         timeout {
 188             set only_five -1
 189         }
 190     }
 191 }
 192
 193 set name "thread-specific breakpoint is thread-specific"
 194 if {$only_five ==  1} { pass $name }
 195 if {$only_five ==  0} { fail $name }
 196 if {$only_five == -1} { fail "$name (timeout)" }
 197
 198
 199 ### Select a particular thread.
 200 proc select_thread {thread} {
 201     global gdb_prompt
 202
 203     send_gdb "thread $thread\n"
 204     gdb_expect {
 205         -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
 206             pass "selected thread: $thread"
 207         }
 208         -re "$gdb_prompt $" {
 209             fail "selected thread: $thread"
 210         }
 211         timeout {
 212             fail "selected thread: $thread (timeout)"
 213         }
 214     }
 215 }
 216
 217 ### Select THREAD, check for a plausible backtrace, and make sure
 218 ### we're actually selecting a different philosopher each time.
 219 ### Return true if the thread had a stack which was not only
 220 ### acceptable, but interesting.  SEEN should be an array in which
 221 ### SEEN(N) exists iff we have found philosopher number N before.
 222
 223 set main_seen 0
 224 set manager_seen 0
 225
 226 proc check_philosopher_stack {thread seen_name} {
 227     global gdb_prompt
 228     upvar $seen_name seen
 229     global main_seen
 230     global expect_manager manager_seen
 231
 232     set name "philosopher is distinct: $thread"
 233     set interesting 0
 234
 235     select_thread $thread
 236     send_gdb "where\n"
 237     gdb_expect {
 238         -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 239             set data $expect_out(1,string)
 240             if {[info exists seen($data)]} {
 241                 fail $name
 242             } else {
 243                 pass $name
 244                 set seen($data) yep
 245             }
 246             set interesting 1
 247         }
 248         -re ".* in __pthread_manager \\(.*$gdb_prompt $" {
 249             if {$manager_seen == 1} {
 250                 fail "manager thread is distinct: $thread"
 251             } else {
 252                 set manager_seen 1
 253                 pass "manager thread is distinct: $thread"
 254             }
 255             set interesting 1
 256         }
 257         -re "pthread_start_thread.*\r\n$gdb_prompt $" {
 258             ## Maybe the thread hasn't started yet.
 259             pass $name
 260         }
 261         -re ".* in main \\(.*$gdb_prompt $" {
 262             if {$main_seen == 1} {
 263                 fail "main is distinct: $thread"
 264             } else {
 265                 set main_seen 1
 266                 pass "main is distinct: $thread"
 267             }
 268             set interesting 1
 269         }
 270         -re " in \\?\\?.*\r\n$gdb_prompt $" {
 271             ## Sometimes we can't get a backtrace.  I'm going to call
 272             ## this a pass, since we do verify that at least one
 273             ## thread was interesting, so we can get more consistent
 274             ## test suite totals.  But in my heart, I think it should
 275             ## be an xfail.
 276             pass $name
 277         }
 278         -re "$gdb_prompt $" {
 279             fail $name
 280         }
 281         timeout {
 282             fail "$name (timeout)"
 283         }
 284     }
 285
 286     return $interesting
 287 }
 288
 289 set any_interesting 0
 290 array set seen {}
 291 unset seen
 292 for {set i 1} {$i <= $nthreads} {incr i} {
 293     if [check_philosopher_stack $i seen] {
 294         set any_interesting 1
 295     }
 296 }
 297
 298 if {$any_interesting} {
 299     pass "found an interesting thread"
 300 } else {
 301     fail "found an interesting thread"
 302 }
 303
 304 if {$manager_seen == $expect_manager} {
 305     pass "manager thread found (not found) when expected"
 306 } else {
 307     fail "manager thread found (not found) when expected"
 308 }